CN102879183B - Method for measuring display brightness of reinforced liquid crystal display modules in high-temperature environments - Google Patents

Abstract

The invention relates to a method for measuring the display brightness of reinforced liquid crystal display modules in high-temperature environments. Measuring equipment for implementing the method comprises a temperature control box, a colorimeter and brightness meter assembly and a high-sensitivity camera. A glass window is arranged on a door of the temperature control box, a reinforced liquid crystal display module to be measured is placed inside the temperature control box, and the colorimeter and brightness meter assembly and the high-sensitivity camera are positioned on the outside of the temperature control box. The method includes that a relation equation between the brightness of pictures shot by the high-sensitivity camera and the brightness, which is measured via the glass window, of the reinforced liquid crystal display module and a relation equation between the display brightness measured via the glass window and the display brightness measured directly are created via two calibration processes, and the screen-front brightness of the reinforced liquid crystal display module in a high-temperature environment can be computed and deduced via the two relation equations. The method has the advantages that the display brightness of the reinforced liquid crystal display module in the high-temperature environment can be measured only by using the existing measuring equipment, the method for measuring the display brightness is simple and feasible, and a measurement result is accurate and reliable.

Description

The measuring method of display brightness under reinforcing LCD MODULE hot environment

Technical field

The invention belongs to technical field of liquid crystal display, be specifically related to the measuring method of reinforcing LCD MODULE display brightness in high temperature environments.

Background technology

Be different from common display apparatus for commercial use, military some particular/special requirements of LCD MODULE demand fulfillment, comprise high brightness, high-contrast, high electromagnetic screen, wide working temperature etc.Because of the requirement of its high reliability, military LCD MODULE needs, through thermocycling, vibratory test, humid test, mould test etc., still can normally work in the presence of a harsh environment to ensure usually.

At present, usually adopt and the method for reinforcing is shielded to common liquid crystals improve its reliability, above common liquid crystals display screen, use optical cement as the bonding one block of reinforcing glass with anti-reflection, electro-magnetic screen function of cementing agent exactly.Reinforce glass and be generally optics execution glass, be coated with anti-reflection film in one side, another side is coated with the ito film and the optical match layer close with the refractive index of optical cement with electro-magnetic screen function.Patent " a kind of reinforced liquid crystal display module and preparation method thereof the " (application number: 201110173947.9) describe the manufacture craft process of reinforcing LCD MODULE in detail of Avic Huadong Photoelectric Co., Ltd.'s application.

Brightness before usual employing chroma luminance measurement amount display screen.But because chroma luminance meter comprises a lot of high-precision optical element and electronic component, under can only normal temperature environment being operated in, cannot at high temperature work, therefore up to now, reinforce the display characteristic under manual method all can only being adopted to judge hot environment when each manufacturer of LCD MODULE carries out hot test.When carrying out hot test, first tested reinforcing display module is put into temperature control box, allow tested reinforcing LCD MODULE show complete white field, then temperature control box temperature is risen to 60 DEG C, after insulation a period of time, rely on human eye subjective judgement display performance whether normal.If human eye sees that the change of brightness and homogeneity appears in tested reinforcing LCD MODULE viewing area, then judge that this module is substandard product.

There is several drawback in the existing hot test based on human eye subjective judgement: 1, False Rate is large: compared to surveying instrument, and the sensitivity of human eye is lower, and the situation human eye that a lot of intrinsic brilliance has changed cannot detect, and causes erroneous judgement; 2, subjective impact is large: human eye exists larger difference, and the sensitivity difference of brightness, homogeneity is comparatively large, causes the inconsistent of product acceptability criteria; 3, proving time is long: the error that manufacturer brings in order to avoid artificial judgment, often carries out multiple high temp test, and each hot test will continue more than 2 hours, and repeatedly cyclic test causes the waste of time, human and material resources.And customize under hot environment still can the chroma luminance testing tool of steady operation, then need to spend a large amount of financial resources, need to transform existing equipment simultaneously.Therefore exploitation can use existing testing apparatus to the method for reinforcing LCD MODULE display brightness under hot environment and measuring, manufacturing enterprise can be helped when not needing to improve product export qualification rate when carrying out substantial contribution input, reduction production cost.

Summary of the invention

In order to improve reinforce LCD MODULE in high temperature environments display brightness Detection accuracy, shorten detection time, the invention provides the measuring method of display brightness under a kind of reinforcing LCD MODULE hot environment using conventional testing tool just can complete.

Concrete technical scheme of the present invention is as follows:

1. reinforce the measuring method of LCD MODULE display brightness in high temperature environments, measure device therefor and comprise temperature control box, chroma luminance meter and high-sensitivity camera (CCD); The door of described temperature control box is provided with glass window, tested reinforcing LCD MODULE is placed on the inside of temperature control box, and chroma luminance meter and high-sensitivity camera (CCD) are positioned at the outside of temperature control box;

(1) do not start temperature control box, open the door of temperature control box, open tested reinforcing LCD MODULE power switch, display complete white field picture, directly measure brightness before the screen of tested reinforcing LCD MODULE central point with chroma luminance meter, obtain brightness value before the first screen, be designated as L ₁₀₀, index number wherein represents the front brightness of screen, described L ₁₀₀in index number represent that liquid crystal pixel aperture is brightness before the screen of maximum opening 100%;

(2) temperature control box is not started, tested reinforcing LCD MODULE display complete white field picture, closes the door of temperature control box, measures brightness before the screen of tested reinforcing LCD MODULE central point through the glass window chroma luminance measurement of temperature control box, obtain brightness value before the second screen, be designated as L ₁₀₀'; Taken the brightness picture of tested reinforcing LCD MODULE display by the glass window on temperature control chamber door with CCD, the brightness value obtaining the center picture point of CCD shooting is designated as G ₁₀₀;

(3) the liquid crystal pixel aperture of tested reinforcing LCD MODULE is changed, namely to 80%, 60%, 40%, 20% and 0% of maximum opening, respectively repeat steps under often kind of brightness conditions (1) and (2), obtain one group first respectively and shield front brightness value and be designated as L respectively ₈₀, L ₆₀, L ₄₀, L ₂₀, L ₀; One group second shields front brightness value and is designated as L respectively ₈₀', L ₆₀', L ₄₀', L ₂₀', L ₀'; The brightness of one picture group sheet central point is designated as G respectively ₈₀, G ₆₀, G ₄₀, G ₂₀, G ₀;

(4) by L ₁₀₀, L ₈₀, L ₆₀, L ₄₀, L ₂₀, L ₀and L ₁₀₀', L ₈₀', L ₆₀', L ₄₀', L ₂₀', L ₀' substitute into following formula 1 and formula 2, calculate k ₁and b ₁, to obtain before the screen directly measuring tested reinforcing LCD MODULE brightness L and through the relation equation before the screen of the tested reinforcing LCD MODULE of the glass window measurement on temperature control chamber door between brightness L ', as shown in Equation 3;

$k_1=\frac{\mathrm{N\Σ}{L}_i^{\′}{L}_i-\mathrm{\Σ}{L^{\′}}_i\mathrm{\Σ}{L}_i}{\mathrm{N\Σ}{L}_i^{\′2}-{\left(\mathrm{\Σ}{L^{\′}}_2\right)}^2},$ i＝100,80,60,40,20,0 （1）

$b_1=\frac{\underset{i=1}{\overset{N}{\mathrm{\Σ}}}{L}_i}{N}-a\frac{\underset{i=1}{\overset{N}{\mathrm{\Σ}}}{L^{\′}}_i}{N},$ i＝100,80,60,40,20,0 （2）

L=k ₁L′+b ₁（3）

In formula, N is sample number, is 6 herein.K ₁for the slope of fitting a straight line between L and L ', k ₁value is 0 ~ 1, b ₁for the zero point of fitting a straight line between L and L ', b ₁without fixed range;

(5) by L ₁₀₀', L ₈₀', L ₆₀', L ₄₀', L ₂₀', L ₀' and G ₁₀₀, G ₈₀, G ₆₀, G ₄₀, G ₂₀, G ₀substitute into following formula 4 and formula 5, calculate k ₂and b ₂obtain through on temperature control chamber door glass window measure tested reinforcing LCD MODULE screen before brightness L ' and with high-sensitivity camera (CCD) through on temperature control chamber door glass window take tested reinforcing LCD MODULE center picture brightness G between relation equation, as shown in Equation 6

$k_2\text{=}\frac{\mathrm{N\Σ}{G}_i{L}_i^{\′}-\mathrm{\Σ}{G}_i\mathrm{\Σ}{L^{\′}}_i}{\mathrm{N\Σ}{G}_i^2-{\left(\mathrm{\Σ}{G}_i\right)}^2},$ i＝100,80,60,40,20,0 （4）

$b_2=\frac{\underset{i=1}{\overset{N}{\mathrm{\Σ}}}{L^{\′}}_i}{N}-a\frac{\underset{i=1}{\overset{N}{\mathrm{\Σ}}}{G}_i}{N},$ i＝100,80,60,40,20,0 （5）

L′=k ₂G+b ₂（6）

In formula, N is sample number, is 6 herein; K ₂for the slope of fitting a straight line between L ' and G, k ₂value is 0 ~ 1, b ₂for the zero point of fitting a straight line between L ' and G, b ₂without fixed range;

(6) close the door of temperature control box, open tested reinforcing LCD MODULE power switch, display complete white field picture, with the programming rate not higher than 1 DEG C/min, temperature control the temperature inside the box is raised to 60 DEG C, insulation is no less than 60 minutes; The viewing area of tested reinforcing LCD MODULE is taken through the glass window on temperature control chamber door, the Pic that Shows Picture of tested reinforcing LCD MODULE under obtaining high temperature by high-sensitivity camera (CCD) ₆₅;

(7) by Pic ₆₅import in data processing software Matlab and process, the Pic that Shows Picture of tested reinforcing LCD MODULE under obtaining high temperature ₆₅each pixel high temperature brightness G _{i, j}, wherein, i and j is display resolution; By G _i,jbring above-mentioned formula 6 into, obtain the front brightness L of each pixel high temperature screen of the tested reinforcing LCD MODULE of the glass window through temperature control box _{i, j}';

(8) by brightness L before each pixel high temperature screen of the tested reinforcing LCD MODULE of the glass window through temperature control box _{i, j}' substitute into above-mentioned formula 3, obtain the front brightness L of high temperature screen of each pixel of tested reinforcing LCD MODULE directly measured _{i, j};

(9) LCD MODULE center brightness L is reinforced under calculating hot environment respectively _center, reinforce LCD MODULE 9 homogeneity P under hot environment ₉, specific formula for calculation is as follows:

$L_{\mathrm{center}}=\frac{\underset{i=\frac{M}{2}-8}{\overset{i=\frac{M}{2}+8}{\mathrm{\Σ}}}\underset{j=\frac{N}{2}-8}{\overset{j=\frac{N}{2}+8}{\mathrm{\Σ}}}{L}_{i,j}}{16\×16},$ i＝1~16,j＝1~16 （7）

$P_9=\frac{\frac{\underset{i=\frac{M}{4}-8}{\overset{i=\frac{M}{4}+8}{\mathrm{\Σ}}}\underset{j=\frac{N}{4}-8}{\overset{j=\frac{N}{4}+8}{\mathrm{\Σ}}}{L}_{i,j}}{16\×16}+\frac{\underset{i=\frac{2M}{4}-8}{\overset{i=\frac{2M}{4}+8}{\mathrm{\Σ}}}\underset{j=\frac{N}{4}-8}{\overset{j=\frac{N}{4}+8}{\mathrm{\Σ}}}{L}_{i,j}}{16\×16}+\frac{\underset{i=\frac{3M}{4}-8}{\overset{i=\frac{3M}{4}+8}{\mathrm{\Σ}}}\underset{j=\frac{N}{4}-8}{\overset{j=\frac{N}{4}+8}{\mathrm{\Σ}}}{L}_{i,j}}{16\×16}}{9}$

$+\frac{\frac{\underset{i=\frac{M}{4}-8}{\overset{i=\frac{M}{4}+8}{\mathrm{\Σ}}}\underset{j=\frac{2N}{4}-8}{\overset{j=\frac{2N}{4}+8}{\mathrm{\Σ}}}{L}_{i,j}}{16\×16}+\frac{\underset{i=\frac{2M}{4}-8}{\overset{i=\frac{2M}{4}+8}{\mathrm{\Σ}}}\underset{j=\frac{2N}{4}-8}{\overset{j=\frac{2N}{4}+8}{\mathrm{\Σ}}}{L}_{i,j}}{16\×16}+\frac{\underset{i=\frac{3M}{4}-8}{\overset{i=\frac{3M}{4}+8}{\mathrm{\Σ}}}\underset{j=\frac{2N}{4}-8}{\overset{j=\frac{2N}{4}+8}{\mathrm{\Σ}}}{L}_{i,j}}{16\×16}}{9},$ i＝1~16,j＝1~16

$+\frac{\frac{\underset{i=\frac{M}{4}-8}{\overset{i=\frac{M}{4}+8}{\mathrm{\Σ}}}\underset{j=\frac{3N}{4}-8}{\overset{j=\frac{3N}{4}+8}{\mathrm{\Σ}}}{L}_{i,j}}{16\×16}+\frac{\underset{i=\frac{2M}{4}-8}{\overset{i=\frac{2M}{4}+8}{\mathrm{\Σ}}}\underset{j=\frac{3N}{4}-8}{\overset{j=\frac{3N}{4}+8}{\mathrm{\Σ}}}{L}_{i,j}}{16\×16}+\frac{\underset{i=\frac{3M}{4}-8}{\overset{i=\frac{3M}{4}+8}{\mathrm{\Σ}}}\underset{j=\frac{3N}{4}-8}{\overset{j=\frac{3N}{4}+8}{\mathrm{\Σ}}}{L}_{i,j}}{16\×16}}{9}---\left(8\right)$

LCD MODULE center brightness L is reinforced under calculating hot environment according to above-mentioned formula (7) _center, under calculating hot environment according to above-mentioned formula (8), reinforce LCD MODULE 9 homogeneity P ₉light characteristic index;

In formula (7) and formula (8), M and N is the display resolution of tested reinforcing LCD MODULE.

2. under calculating hot environment, reinforce LCD MODULE 25 homogeneity P ₂₅light characteristic index; Specific formula for calculation is as follows:

$P_{25}=\frac{\frac{\underset{i=\frac{M}{6}-8}{\overset{i=\frac{M}{6}+8}{\mathrm{\Σ}}}\underset{j=\frac{N}{6}-8}{\overset{j=\frac{N}{6}+8}{\mathrm{\Σ}}}{L}_{i,j}}{16\×16}+\frac{\underset{i=\frac{2M}{6}-8}{\overset{i=\frac{2M}{6}+8}{\mathrm{\Σ}}}\underset{j=\frac{N}{6}-8}{\overset{j=\frac{N}{6}+8}{\mathrm{\Σ}}}{L}_{i,j}}{16\×16}+\frac{\underset{i=\frac{3M}{6}-8}{\overset{i=\frac{3M}{6}+8}{\mathrm{\Σ}}}\underset{j=\frac{N}{6}-8}{\overset{j=\frac{N}{6}+8}{\mathrm{\Σ}}}{L}_{i,j}}{16\×16}+\frac{\underset{i=\frac{4M}{6}-8}{\overset{i=\frac{4M+8}{6}}{\mathrm{\Σ}}}\underset{i=\frac{N}{6}-8}{\overset{j=\frac{N}{6}+8}{\mathrm{\Σ}}}{L}_{i,j}}{16\×16}+\frac{\underset{i=\frac{5M}{6}-8}{\overset{i=\frac{5M}{6}+8}{\mathrm{\Σ}}}\underset{j=\frac{N}{6}-8}{\overset{j=\frac{N}{6}+8}{\mathrm{\Σ}}}{L}_{i,j}}{16\×16}}{25}$

$+\frac{\frac{\underset{i=\frac{M}{6}-8}{\overset{i=\frac{M}{6}+8}{\mathrm{\Σ}}}\underset{j=\frac{2N}{6}-8}{\overset{j=\frac{2N}{6}+8}{\mathrm{\Σ}}}{L}_{i,j}}{16\×16}+\frac{\underset{i=\frac{2M}{6}-8}{\overset{i=\frac{2M}{6}+8}{\mathrm{\Σ}}}\underset{j=\frac{2N}{6}-8}{\overset{j=\frac{2N}{6}+8}{\mathrm{\Σ}}}{L}_{i,j}}{16\×16}+\frac{\underset{i=\frac{3M}{6}-8}{\overset{i=\frac{3M}{6}+8}{\mathrm{\Σ}}}\underset{j=\frac{2N}{6}-8}{\overset{j=\frac{2N}{6}+8}{\mathrm{\Σ}}}{L}_{i,j}}{16\×16}+\frac{\underset{i=\frac{4M}{6}-8}{\overset{i=\frac{4M+8}{6}}{\mathrm{\Σ}}}\underset{i=\frac{2N}{6}-8}{\overset{j=\frac{2N}{6}+8}{\mathrm{\Σ}}}{L}_{i,j}}{16\×16}+\frac{\underset{i=\frac{5M}{6}-8}{\overset{i=\frac{5M}{6}+8}{\mathrm{\Σ}}}\underset{j=\frac{2N}{6}-8}{\overset{j=\frac{2N}{6}+8}{\mathrm{\Σ}}}{L}_{i,j}}{16\×16}}{25}$

$+\frac{\frac{\underset{i=\frac{M}{6}-8}{\overset{i=\frac{M}{6}+8}{\mathrm{\Σ}}}\underset{j=\frac{3N}{6}-8}{\overset{j=\frac{3N}{6}+8}{\mathrm{\Σ}}}{L}_{i,j}}{16\×16}+\frac{\underset{i=\frac{2M}{6}-8}{\overset{i=\frac{2M}{6}+8}{\mathrm{\Σ}}}\underset{j=\frac{3N}{6}-8}{\overset{j=\frac{3N}{6}+8}{\mathrm{\Σ}}}{L}_{i,j}}{16\×16}+\frac{\underset{i=\frac{3M}{6}-8}{\overset{i=\frac{3M}{6}+8}{\mathrm{\Σ}}}\underset{j=\frac{3N}{6}-8}{\overset{j=\frac{3N}{6}+8}{\mathrm{\Σ}}}{L}_{i,j}}{16\×16}+\frac{\underset{i=\frac{4M}{6}-8}{\overset{i=\frac{4M+8}{6}}{\mathrm{\Σ}}}\underset{i=\frac{3N}{6}-8}{\overset{j=\frac{3N}{6}+8}{\mathrm{\Σ}}}{L}_{i,j}}{16\×16}+\frac{\underset{i=\frac{5M}{6}-8}{\overset{i=\frac{5M}{6}+8}{\mathrm{\Σ}}}\underset{j=\frac{3N}{6}-8}{\overset{j=\frac{3N}{6}+8}{\mathrm{\Σ}}}{L}_{i,j}}{16\×16}}{25}$

$+\frac{\frac{\underset{i=\frac{M}{6}-8}{\overset{i=\frac{M}{6}+8}{\mathrm{\Σ}}}\underset{j=\frac{4N}{6}-8}{\overset{j=\frac{4N}{6}+8}{\mathrm{\Σ}}}{L}_{i,j}}{16\×16}+\frac{\underset{i=\frac{2M}{6}-8}{\overset{i=\frac{2M}{6}+8}{\mathrm{\Σ}}}\underset{j=\frac{4N}{6}-8}{\overset{j=\frac{4N}{6}+8}{\mathrm{\Σ}}}{L}_{i,j}}{16\×16}+\frac{\underset{i=\frac{3M}{6}-8}{\overset{i=\frac{3M}{6}+8}{\mathrm{\Σ}}}\underset{j=\frac{4N}{6}-8}{\overset{j=\frac{4N}{6}+8}{\mathrm{\Σ}}}{L}_{i,j}}{16\×16}+\frac{\underset{i=\frac{4M}{6}-8}{\overset{i=\frac{4M+8}{6}}{\mathrm{\Σ}}}\underset{i=\frac{4N}{6}-8}{\overset{j=\frac{4N}{6}+8}{\mathrm{\Σ}}}{L}_{i,j}}{16\×16}+\frac{\underset{i=\frac{5M}{6}-8}{\overset{i=\frac{5M}{6}+8}{\mathrm{\Σ}}}\underset{j=\frac{4N}{6}-8}{\overset{j=\frac{4N}{6}+8}{\mathrm{\Σ}}}{L}_{i,j}}{16\×16}}{25}$

$+\frac{\frac{\underset{i=\frac{M}{6}-8}{\overset{i=\frac{M}{6}+8}{\mathrm{\Σ}}}\underset{j=\frac{5N}{6}-8}{\overset{j=\frac{5N}{6}+8}{\mathrm{\Σ}}}{L}_{i,j}}{16\×16}+\frac{\underset{i=\frac{2M}{6}-8}{\overset{i=\frac{2M}{6}+8}{\mathrm{\Σ}}}\underset{j=\frac{5N}{6}-8}{\overset{j=\frac{5N}{6}+8}{\mathrm{\Σ}}}{L}_{i,j}}{16\×16}+\frac{\underset{i=\frac{3M}{6}-8}{\overset{i=\frac{3M}{6}+8}{\mathrm{\Σ}}}\underset{j=\frac{5N}{6}-8}{\overset{j=\frac{5N}{6}+8}{\mathrm{\Σ}}}{L}_{i,j}}{16\×16}+\frac{\underset{i=\frac{4M}{6}-8}{\overset{i=\frac{4M+8}{6}}{\mathrm{\Σ}}}\underset{i=\frac{5N}{6}-8}{\overset{j=\frac{5N}{6}+8}{\mathrm{\Σ}}}{L}_{i,j}}{16\×16}+\frac{\underset{i=\frac{5M}{6}-8}{\overset{i=\frac{5M}{6}+8}{\mathrm{\Σ}}}\underset{j=\frac{5N}{6}-8}{\overset{j=\frac{5N}{6}+8}{\mathrm{\Σ}}}{L}_{i,j}}{16\×16}}{25}$

,i＝1~16,j＝1~16

（9）

LCD MODULE 25 homogeneity P are reinforced under obtaining hot environment according to above-mentioned formula (9) ₂₅; In formula (9), M and N is the display resolution of tested reinforcing LCD MODULE.

Beneficial effect of the present invention is: provide a kind of measuring method of reinforcing display brightness under display module hot environment.Because the optical devices such as chroma luminance meter, high-sensitivity camera (CCD) cannot be operated in hot environment, therefore tested reinforcing LCD MODULE is put into hot environment by this measuring method, and the optical test equipments such as chroma luminance meter, CCD are placed in normal temperature environment.By twice calibration process, establish (1) CCD pictures taken brightness and through glass window measure reinforcing liquid crystal display mode Block Brightness between relation equation; (2) through the glass window display brightness measured and the relation equation directly measuring the display brightness obtained.Taking tested reinforcing LCD MODULE display frame under hot environment by being in CCD under normal temperature, under utilizing 2 relation equations just can calculate to derive hot environment, reinforcing brightness before the screen of LCD MODULE.This measuring method is adopted to measure the display brightness reinforced under LCD MODULE hot environment, only need the testing apparatus using manufacturing enterprise generally to have, do not need to drop into substantial contribution and buy extra testing apparatus, measuring method is simple, and measurement result accurately and reliably.When not changing temperature control box, chroma luminance meter, high-sensitivity camera, after only needing a calibration process to obtain 2 relation equations, just can measure multiple reinforcing LCD MODULE, not need again to demarcate.Facts have proved, measure according to the display brightness of this measuring method to the reinforcing LCD MODULE under hot environment, and carry out the whether qualified judgement of product according to measurement result, successfully can not only check out the unacceptable product that human eye judges, and can check out that first time circulation human eye judges qualified and circulates through several times and just occur the unacceptable product of display dot, its product qualification determination accuracy rate is apparently higher than the subjective judgement of human eye.

Accompanying drawing explanation

Fig. 1 reinforces LCD MODULE schematic diagram.

Fig. 2 is that reinforcing LCD MODULE Strehl ratio directly measured by chroma luminance meter.

Fig. 3 is that chroma luminance meter measures reinforcing LCD MODULE Strehl ratio through the glass window on temperature control chamber door.

Fig. 4 is that CCD reinforces LCD MODULE through the glass window shooting on temperature control chamber door.

Fig. 5 is that the different brightness that CCD reinforces LCD MODULE through the glass window shooting on temperature control chamber door Show Picture.

Fig. 6 reinforces LCD MODULE brightness measurement 9 distribution plans.

Fig. 7 reinforces LCD MODULE brightness measurement 25 distribution plans.

Embodiment

Below in conjunction with embodiment, the present invention is further described.

Embodiment 1

For ease of understanding the present invention, first the structure of reinforcing LCD MODULE is simply introduced.See Fig. 1, common liquid crystals screen comprises liquid crystal display upper and lower base plate and middle filling liquid crystal material.Due to the optical activity of liquid crystal molecule, the light of backlight luminescence needs to become after polarized light through rear polarizer to enter liquid crystal cell.Only have and just can reach human eye with front polaroid polarization direction light always.When reinforcing common liquid crystals screen, adopt optical cement that reinforcing glass is bonded to the upper substrate of liquid crystal display.Reinforce the function that glass has anti-reflection, electromagnetic screen.

Because the optical test equipments such as chroma luminance meter, high-sensitivity camera (CCD) cannot work in hot environment, therefore tested reinforcing LCD MODULE is put into hot environment (temperature control box) by this measuring method, and the optical test equipments such as chroma luminance meter, CCD are placed in normal temperature environment, measure and complete through the glass window on temperature control chamber door.

Refer to Fig. 2.Tested reinforcing LCD MODULE is put on temperature control box support, opens the door of temperature control box.Open and reinforce LCD MODULE power switch, adjustable liquid crystal display screen drive singal, produce red, green, blue sub-pixel luminence and be respectively (255,255,255) signal, now liquid crystal pixel aperture is 100%, and tested reinforcing LCD MODULE display complete white field picture, before screen, brightness is maximal value (100%).Chroma luminance meter is fixed on tripod, adjustment tripod positions, chroma luminance meter measurement point is made to aim at the central point reinforcing LCD MODULE, brightness before the screen of tested reinforcing LCD MODULE central point is directly measured with chroma luminance meter, obtaining display brightness is brightness before the screen of 100%, is designated as L ₁₀₀, L ₁₀₀=965.43nit.Change liquid crystal display drive singal, produce the signal that red, green, blue sub-pixel luminence is respectively (255 × 0.8,255 × 0.8,255 × 0.8), now liquid crystal pixel aperture is 80%, and now tested reinforcing LCD MODULE display brightness is 80% of maximal value.Directly measure brightness before the screen of tested reinforcing LCD MODULE central point with chroma luminance meter, obtaining display brightness is brightness before the screen of 80%, is designated as L ₈₀, L ₈₀=779.84nit.Repeat as above step, change liquid crystal display drive singal respectively, red, green, blue sub-pixel luminence is made to be respectively 60%, 40%, 20% and 0% of maximal value 255, now liquid crystal pixel aperture is respectively 60%, 40%, 20% and 0% of maximal value, produce the display frame that brightness is respectively 60%, 40%, 20% and 0%, directly measure brightness before tested reinforcing LCD MODULE central point screen with chroma luminance meter, obtain brightness value L before the screen of enabling 60% brightness ₆₀, L ₆₀brightness value L before the screen of=565.97nit, 40% brightness of opening the door ₄₀, L ₄₀brightness value L before the screen of=393.01nit, 20% brightness of opening the door ₂₀, L ₂₀brightness value L before the screen of=191.90nit, 0% brightness of opening the door ₀, L ₀=0.812nit, by the measurement data record of chroma luminance meter, as shown in table 1.

Table 1

	100%	80%	60%	40%	20%	0%
							L(nit)	965.43	779.84	565.97	393.01	191.90	0.812

Refer to Fig. 3, tested reinforcing LCD MODULE is put on temperature control box support, open tested reinforcing LCD MODULE power switch, adjustable liquid crystal display screen drive singal, produces red, green, blue sub-pixel luminence and is respectively (255,255,255) signal, now liquid crystal pixel aperture is 100%, and tested reinforcing LCD MODULE display complete white field picture, before screen, brightness is maximal value (100%).Close the door of temperature control box, do not start temperature control box.Chroma luminance meter is fixed on tripod, adjustment tripod positions, chroma luminance meter measurement point is made to aim at the central point reinforcing LCD MODULE, brightness before the screen of tested reinforcing LCD MODULE central point is directly measured with chroma luminance meter, the display brightness obtaining measuring through windowpane is brightness before the screen of 100%, is designated as L ₁₀₀', L ₁₀₀'=586.20nit.Change liquid crystal display drive singal, produce the signal that red, green, blue sub-pixel luminence is respectively (255 × 0.8,255 × 0.8,255 × 0.8), now liquid crystal pixel aperture is 80%, and now tested reinforcing LCD MODULE display brightness is 80% of maximal value.To measure brightness before the screen of tested reinforcing LCD MODULE central point through the windowpane on temperature control chamber door with chroma luminance meter, the display brightness obtaining measuring through windowpane is brightness before the screen of 80%, is designated as L ₈₀', L ₈₀'=460.17nit.Repeat as above step, change liquid crystal display drive singal respectively, red, green, blue sub-pixel luminence is made to be respectively 60%, 40%, 20% and 0% of maximal value 255, now liquid crystal pixel aperture is respectively 60%, 40%, 20% and 0% of maximal value, produce the display frame that brightness is respectively 60%, 40%, 20% and 0%, brightness before tested reinforcing LCD MODULE central point screen is measured through the glass window on temperature control chamber door, brightness value L before the screen of 60% brightness that obtains closing the door with chroma luminance meter ₆₀', L ₆₀brightness value L before the screen of '=345.98nit, 40% brightness of closing the door ₄₀', L ₄₀brightness value L before the screen of '=228.56nit, 20% brightness of closing the door ₂₀', L ₂₀brightness value L before the screen of '=123.57nit, 0% brightness of closing the door ₀', L ₀'=0.688nit, by the measurement data record of chroma luminance meter, as shown in table 2.

Table 2

	100%	80%	60%	40%	20%	0%
							L′(nit)	586.20	460.17	345.98	228.56	123.57	0.688

Refer to Fig. 4, tested reinforcing LCD MODULE is put on temperature control box support, open tested reinforcing LCD MODULE power switch, adjustable liquid crystal display screen drive singal, produces red, green, blue sub-pixel luminence and is respectively (255,255,255) signal, now liquid crystal pixel aperture is 100%, now tested reinforcing LCD MODULE display complete white field picture, and before screen, brightness is maximal value (100%).Close the door of temperature control box, do not start temperature control box.CCD is placed on tripod, by the glass window of the position of tripod as far as possible on temperature control chamber door, ensures that CCD can the complete display frame photographing tested reinforcing LCD MODULE.Take the complete white field picture of tested reinforcing LCD MODULE display through the glass window on temperature control chamber door with CCD.Obtain the picture of Fig. 6 (a).Change liquid crystal display drive singal, produce the signal that red, green, blue sub-pixel luminence is respectively (255 × 0.8,255 × 0.8,255 × 0.8), now liquid crystal pixel aperture is 80%, and now tested reinforcing LCD MODULE display brightness is 80% of maximal value.Take 80% brightness picture of tested reinforcing LCD MODULE display through the glass window on temperature control chamber door with CCD.Obtain the picture of Fig. 6 (b).Repeat as above step, change liquid crystal display drive singal respectively, red, green, blue sub-pixel luminence is made to be respectively 60%, 40%, 20% and 0% of maximal value 255, now liquid crystal pixel aperture is respectively 60%, 40%, 20% and 0% of maximal value, produce the display frame that brightness is respectively 60%, 40%, 20% and 0%, take the brightness picture of tested reinforcing LCD MODULE display with CCD through the glass window on temperature control chamber door, obtain the picture of Fig. 5 (c) to Fig. 5 (f).

Picture (a) to (f) in Fig. 5 is imported in the large data process software Matlab of MathWorkshop Company, reads the brightness value of central point respectively, be designated as the CCD brightness value G of 100% brightness of closing the door ₁₀₀, G ₁₀₀=237, close the door the CCD brightness value G of 80% brightness ₈₀, G ₈₀=184, close the door the CCD brightness value G of 60% brightness ₆₀, G ₆₀=140, close the door the CCD brightness value G of 40% brightness ₄₀, G ₄₀=95, close the door the CCD brightness value G of 20% brightness ₂₀, G ₂₀=49, close the door the CCD brightness value G of 0% brightness ₀, G ₀=1, as shown in table 3.

Table 3

	100%	80%	60%	40%	20%	0%
							G	237	184	140	95	49	1

Data in table 2 and table 3 are substituted into following formula (formula (4) and formula (5)), obtains k ₂and b ₂.

$k_2=\frac{\mathrm{N\Σ}{G}_i{L}_i^{\′}-\mathrm{\Σ}{G}_i\mathrm{\Σ}{L^{\′}}_i}{\mathrm{N\Σ}{G}_i^2-{\left(\mathrm{\Σ}{G}_i\right)}^2},$ i＝100,80,60,40,20,0

$b_2=\frac{\underset{i=1}{\overset{N}{\mathrm{\Σ}}}{L^{\′}}_i}{N}-a\frac{\underset{i=1}{\overset{N}{\mathrm{\Σ}}}{G}_i}{N},$ i＝100,80,60,40,20,0

Thus the relation equation that the reinforcing LCD MODULE Strehl ratio L ' and CCD obtaining measuring through the glass window on temperature control chamber door Shows Picture between brightness G through the reinforcing LCD MODULE that the glass window on temperature control chamber door is taken, be shown below:

L′=2.4932G-1.8633 （10）

Data in table 1 and table 2 are substituted into following formula (formula (1) and formula (2)), obtains k ₁and b ₁.

$k_1=\frac{\mathrm{N\Σ}{L}_i^{\′}{L}_i-\mathrm{\Σ}{L^{\′}}_i\mathrm{\Σ}{L}_i}{\mathrm{N\Σ}{L}_i^{\′2}-{\left(\mathrm{\Σ}{L^{\′}}_2\right)}^2},$ i＝100,80,60,40,20,0

$b_1=\frac{\underset{i=1}{\overset{N}{\mathrm{\Σ}}}{L}_i}{N}-a\frac{\underset{i=1}{\overset{N}{\mathrm{\Σ}}}{L^{\′}}_i}{N},$ i＝100,80,60,40,20,0

Thus obtain the reinforcing LCD MODULE Strehl ratio L ' measured through the glass window on temperature control chamber door and the relation equation directly measured between the front brightness L of tested reinforcing LCD MODULE screen, be shown below:

L=1.6680L′-2.3299 （11）

Tested reinforcing LCD MODULE is put on temperature control box support, open tested reinforcing LCD MODULE power switch, adjustable liquid crystal display screen drive singal, produce red, green, blue sub-pixel luminence and be respectively (255,255,255) signal, now liquid crystal pixel aperture is 100%, tested reinforcing LCD MODULE display complete white field picture.Close the door of temperature control box, start temperature control box, control temperature control box, with the programming rate not higher than 1 DEG C/min, temperature from ambient in temperature control box is raised to 60 DEG C, insulation is no less than 60 minutes.Take the viewing area of tested reinforcing LCD MODULE with CCD through the glass window on temperature control chamber door, under obtaining high temperature, reinforce the Pic that Shows Picture of LCD MODULE _1-65.

To be Showed Picture Pic _1-65import in the large data process software Matlab of MathWorkshop Company, read the brightness value of each pixel, as the reinforcing LCD MODULE for 1024 × 768 resolution, the data G of 1024 × 768 will be obtained _{i, j}(i=1-1024, j=1-768) (overabundance of data is not listed one by one).By G _{i, j}substitute into formula 10, obtain each pixel high temperature brightness L of the tested reinforcing LCD MODULE after through the glass window on temperature control chamber door _{i, j}'; By L _{i, j}' substitute into formula 11, the front brightness L of high temperature screen directly measuring each pixel of tested reinforcing display module display frame can be obtained _{i, j}.

Consider that the brightness of use chroma luminance measurement amount is the mean value of brightness in certain area, therefore need high temperature screen preceding pixel brightness L _{i, j}process, to obtain brightness value in the certain area identical with chroma luminance measuring principle.For brightness before central point screen, get the mean value of central area 16 × 16 pixel as center brightness value.For the pixel resolution of 1024 × 768, i=1024, j=768 in formula (7), formula (8), formula (9), be shown below.

$L_{\mathrm{center}}=\frac{\underset{i=\frac{1024}{2}-8}{\overset{i=\frac{1024}{2}+8}{\mathrm{\Σ}}}\underset{j=\frac{768}{2}-8}{\overset{j=\frac{768}{2}+8}{\mathrm{\Σ}}}{L}_{i,j}}{16\×16}---\left(12\right)$

Center brightness L can be obtained according to formula 12 _centerfor 844.29nit.

Refer to reinforcing LCD MODULE brightness measurement 9 distribution plans of Fig. 6.Wherein the brightness calculation of first is shown below.The calculating of other points is identical, repeats no more.Obtain reinforcing LCD MODULE brightness measurement 9 brightness values, as shown in table 4.

$L_1=\frac{\underset{i=\frac{1024}{4}-8}{\overset{i=\frac{1024}{4}+8}{\mathrm{\Σ}}}\underset{i=\frac{768}{4}-8}{\overset{j=\frac{768}{4}+8}{\mathrm{\Σ}}}{L}_{i,j}}{16\×16}---\left(13\right)$

Table 4

Data in table 4 are substituted into following formula, 9 brightness uniformity P can be obtained ₉.

$P_9=1-\frac{L_{\max }-L_{\min }}{L_{\mathrm{center}}}=1-\frac{844.29-697.13}{844.29}=82.57\%---\left(14\right)$

Require higher product for some, manufacturing enterprise adopts 25 mensurations to evaluate homogeneity.Refer to reinforcing LCD MODULE brightness measurement 25 distribution plans of Fig. 7.Wherein the brightness calculation of first is shown below.The calculating of other points is identical, repeats no more.Obtain reinforcing LCD MODULE brightness measurement 25 brightness values, as shown in table 5.

$L_1=\frac{\underset{i=\frac{1024}{6}-8}{\overset{i=\frac{1024}{6}+8}{\mathrm{\Σ}}}\underset{j=\frac{768}{6}-8}{\overset{j=\frac{768}{6}+8}{\mathrm{\Σ}}}{L}_{i,j}}{16\×16}---\left(15\right)$

Table 5

Data in table 5 are substituted into formula 9 and can obtain 25 brightness uniformity P ₂₅.

$P_{25}=1-\frac{L_{\max }-L_{\min }}{L_{\mathrm{center}}}=1-\frac{857.21-671.81}{857.21}=78.37\%---\left(16\right)$

Can find out, under reinforcing LCD MODULE hot environment, display centre brightness reaches 884.29nit, and 25 show uniformities are 78.37%, and under this product hot environment is described, display performance is good, reaches criterion of acceptability.

Embodiment 2

Use temperature control box, chroma luminance meter, the high-sensitivity camera identical with embodiment 1.Embodiment 1 completes demarcation, obtains the relation equation of formula 10 and formula 11.Embodiment 2 does not need again to demarcate, and directly utilizes formula 10 and formula 11.

Tested reinforcing LCD MODULE is put on temperature control box support, open tested reinforcing LCD MODULE power switch, adjustable liquid crystal display screen drive singal, produce red, green, blue sub-pixel luminence and be respectively (255,255,255) signal, now liquid crystal pixel aperture is 100%, tested reinforcing LCD MODULE display complete white field picture.Close the door of temperature control box, start temperature control box, control temperature control box, with the programming rate not higher than 1 DEG C/min, temperature from ambient in temperature control box is raised to 60 DEG C, insulation is no less than 60 minutes.The viewing area of tested reinforcing LCD MODULE is taken through the glass window on temperature control chamber door, the Pic that Shows Picture of tested reinforcing LCD MODULE under obtaining high temperature with CCD _2-65.

To be Showed Picture Pic _2-65import in data processing software Matlab, take the disposal route (repeat no more) the same with embodiment 1, obtain center brightness L _centerfor 864.68nit.

Take the disposal route the same with embodiment 1, obtain 9 brightness values, as table 6.Substitute into formula 8 and can obtain 9 brightness uniformity P ₉.

Table 6

$P_9=1-\frac{L_{\max }-L_{\min }}{L_{\mathrm{center}}}=1-\frac{864.68-560.34}{864.68}=64.80\%---\left(17\right)$

Take the disposal route the same with embodiment 1, obtain 25 brightness values, as table 7.Substitute into formula 9 and can obtain 25 brightness uniformity P ₂₅.Table 7

$P_{25}=1-\frac{L_{\max }-L_{\min }}{L_{\mathrm{center}}}=1-\frac{861.07-556.18}{861.07}=64.59\%---\left(18\right)$

Can find out, under tested reinforcing LCD MODULE hot environment, display centre brightness reaches 864.68nit, and show uniformity, lower than 75%, occurs the change of display performance under tested reinforcing LCD MODULE hot environment is described, do not meet criterion of acceptability, this product needed is scrapped or does over again process.

Embodiment 3

Compare with embodiment 1, have employed the temperature control box of different model, chroma luminance meter and high-sensitivity camera still adopt the model of embodiment 1.Need again to implement calibration process.

Take the step identical with embodiment 1, adjust tested reinforcing LCD MODULE display brightness and be respectively 100%, 80%, 60%, 40%, 20%, 0%, obtain respectively the door chroma luminance meter opening temperature control box directly measure tested reinforcing LCD MODULE center screen before brightness L, the door chroma luminance meter of closing temperature control box measure tested reinforcing LCD MODULE center brightness L ' through glass window, close the door high-sensitivity camera of temperature control box takes tested reinforcing LCD MODULE picture center brightness G through glass window, as shown in table 8.

Table 8

	100%	80%	60%	40%	20%	0%
							L（nit）	965.43	779.84	565.97	393.01	191.90	0.92
L′（nit）	624.79	490.01	376.68	255.12	134.56	0.60
							G	240	188	146	99	52	1

L ' in table 8 and G is substituted into following formula (formula (4) and formula (5)), obtains k ₂and b ₂.

$k_2\text{=}\frac{\mathrm{N\Σ}{G}_i{L}_i^{\′}-\mathrm{\Σ}{G}_i\mathrm{\Σ}{L^{\′}}_i}{\mathrm{N\Σ}{G}_i^2-{\left(\mathrm{\Σ}{G}_i\right)}^2},$ i＝100,80,60,40,20,0

$b_2=\frac{\underset{i=1}{\overset{N}{\mathrm{\Σ}}}{L^{\′}}_i}{N}-a\frac{\underset{i=1}{\overset{N}{\mathrm{\Σ}}}{G}_i}{N},$ i＝100,80,60,40,20,0

Thus the relation equation that the reinforcing LCD MODULE Strehl ratio L ' and CCD obtaining measuring through the glass window on temperature control chamber door Shows Picture between brightness G through the reinforcing LCD MODULE that the glass window on temperature control chamber door is taken, be shown below:

L′=2.6076G-2.0311 （19）

L and L ' in table 8 is substituted into following formula (formula (1) and formula (2)), obtains k ₁and b ₁.

$k_1=\frac{\mathrm{N\Σ}{L}_i^{\′}{L}_i-\mathrm{\Σ}{L^{\′}}_i\mathrm{\Σ}{L}_i}{\mathrm{N\Σ}{L}_i^{\′2}-{\left(\mathrm{\Σ}{L^{\′}}_2\right)}^2},$ i＝100,80,60,40,20,0

$b_1=\frac{\underset{i=1}{\overset{N}{\mathrm{\Σ}}}{L}_i}{N}-a\frac{\underset{i=1}{\overset{N}{\mathrm{\Σ}}}{L^{\′}}_i}{N},$ i＝100,80,60,40,20,0

Thus obtain the reinforcing LCD MODULE Strehl ratio L ' measured through the glass window on temperature control chamber door and the relation equation directly measured between the front brightness L of tested reinforcing LCD MODULE screen, be shown below:

L=1.5493L′-1.5923 （20）

Tested reinforcing LCD MODULE is put on temperature control box support, open tested reinforcing LCD MODULE power switch, adjustable liquid crystal display screen drive singal, produce red, green, blue sub-pixel luminence and be respectively (255,255,255) signal, now liquid crystal pixel aperture is 100%, tested reinforcing LCD MODULE display complete white field picture.Close the door of temperature control box, start temperature control box, control temperature control box, with the programming rate not higher than 1 DEG C/min, temperature from ambient in temperature control box is raised to 60 DEG C, insulation is no less than 60 minutes.The viewing area of tested reinforcing LCD MODULE is taken through the glass window on temperature control chamber door, the Pic that Shows Picture of tested reinforcing LCD MODULE under obtaining high temperature with CCD _3-65.

To be Showed Picture Pic _3-65import in data processing software Matlab, take the disposal route (repeat no more) the same with embodiment 1, obtain center brightness L _centerfor 876.46nit.

Take the disposal route the same with embodiment 1, obtain 9 brightness values, as table 9.Substitute into formula 8 and can obtain 9 brightness uniformity P ₉.

Table 9

$P_9=1-\frac{L_{\max }-L_{\min }}{L_{\mathrm{center}}}=1-\frac{.876.68-702.02}{876.68}=80.08\%---\left(21\right)$

Take the disposal route the same with embodiment 1, obtain 25 brightness values, as table 10.Substitute into formula 9 and can obtain 25 brightness uniformity P ₂₅.

Table 10

$P_{25}=1-\frac{L_{\max }-L_{\min }}{L_{\mathrm{center}}}=1-\frac{866.10-687.01}{866.10}=79.32\%---\left(22\right)$

Can find out, under this tested reinforcing LCD MODULE hot environment, display centre brightness reaches 876.46nit, and show uniformity is higher than 75%, and under this tested reinforcing LCD MODULE hot environment is described, display performance is good, reaches criterion of acceptability.

Claims (2)

1. reinforce the measuring method of LCD MODULE display brightness in high temperature environments, it is characterized in that: measure device therefor and comprise temperature control box, chroma luminance meter and high-sensitivity camera (CCD); The door of described temperature control box is provided with glass window, tested reinforcing LCD MODULE is placed on the inside of temperature control box, and chroma luminance meter and high-sensitivity camera (CCD) are positioned at the outside of temperature control box;

(1) do not start temperature control box, open the door of temperature control box, open tested reinforcing LCD MODULE power switch, display complete white field picture, directly measure brightness before the screen of tested reinforcing LCD MODULE central point with chroma luminance meter, obtain brightness value before the first screen, be designated as L ₁₀₀, index number wherein represents the front brightness of screen, described L ₁₀₀in index number represent that liquid crystal pixel aperture is brightness before the screen of maximum 100%;

(2) temperature control box is not started, tested reinforcing LCD MODULE display complete white field picture, closes the door of temperature control box, measures brightness before the screen of tested reinforcing LCD MODULE central point through the glass window chroma luminance measurement of temperature control box, obtain brightness value before the second screen, be designated as L ₁₀₀'; Taken the brightness picture of tested reinforcing LCD MODULE display by the glass window on temperature control chamber door with CCD, the brightness value obtaining the center picture point of CCD shooting is designated as G ₁₀₀;

(3) the liquid crystal pixel aperture of tested reinforcing LCD MODULE is changed, namely to 80%, 60%, 40%, 20% and 0% of maximum opening, respectively repeat steps under often kind of brightness conditions (1) and (2), obtain one group first respectively and shield front brightness value and be designated as L respectively ₈₀, L ₆₀, L ₄₀, L ₂₀, L ₀; One group second shields front brightness value and is designated as L respectively ₈₀', L ₆₀', L ₄₀', L ₂₀', L ₀'; The brightness of one picture group sheet central point is designated as G respectively ₈₀, G ₆₀, G ₄₀, G ₂₀, G ₀;

(4) by L ₁₀₀, L ₈₀, L ₆₀, L ₄₀, L ₂₀, L ₀and L ₁₀₀', L ₈₀', L ₆₀', L ₄₀', L ₂₀', L ₀' substitute into following formula 1 and formula 2, calculate k ₁and b ₁, to obtain before the screen directly measuring tested reinforcing LCD MODULE brightness L and through the relation equation before the screen of the tested reinforcing LCD MODULE of the glass window measurement on temperature control chamber door between brightness L ', as shown in Equation 3;

L＝k ₁L′+b ₁(3)

In formula, N is sample number, is 6 herein; k ₁for the slope of fitting a straight line between L and L ', k ₁value is 0 ~ 1, b ₁for the zero point of fitting a straight line between L and L ', b ₁without fixed range;

(5) by L ₁₀₀', L ₈₀', L ₆₀', L ₄₀', L ₂₀', L ₀' and G ₁₀₀, G ₈₀, G ₆₀, G ₄₀, G ₂₀, G ₀substitute into following formula 4 and formula 5, calculate k ₂and b ₂obtain through on temperature control chamber door glass window measure tested reinforcing LCD MODULE screen before brightness L ' and with high-sensitivity camera (CCD) through on temperature control chamber door glass window take tested reinforcing LCD MODULE center picture brightness G between relation equation, as shown in Equation 6

L′＝k ₂G+b ₂(6)

In formula, N is sample number, is 6 herein; K ₂for the slope of fitting a straight line between L ' and G, k ₂value is 0 ~ 1, b ₂for the zero point of fitting a straight line between L ' and G, b ₂without fixed range;

(6) close the door of temperature control box, open tested reinforcing LCD MODULE power switch, display complete white field picture, with the programming rate not higher than 1 DEG C/min, temperature control the temperature inside the box is raised to 60 DEG C, insulation is no less than 60 minutes; The viewing area of tested reinforcing LCD MODULE is taken through the glass window on temperature control chamber door, the Pic that Shows Picture of tested reinforcing LCD MODULE under obtaining high temperature by high-sensitivity camera (CCD) ₆₅;

(7) by Pic ₆₅import in data processing software Matlab and process, the Pic that Shows Picture of tested reinforcing LCD MODULE under obtaining high temperature ₆₅each pixel high temperature brightness G _i,j, wherein, i and j is display resolution; By G _i,jbring above-mentioned formula 6 into, obtain the front brightness L of each pixel high temperature screen of the tested reinforcing LCD MODULE of the glass window through temperature control box _i,j';

(8) by brightness L before each pixel high temperature screen of the tested reinforcing LCD MODULE of the glass window through temperature control box _i,j' substitute into above-mentioned formula 3, obtain the front brightness L of high temperature screen of each pixel of tested reinforcing LCD MODULE directly measured _i,j;

(9) LCD MODULE center brightness L is reinforced under calculating hot environment respectively _center, reinforce LCD MODULE 9 homogeneity P under hot environment ₉, specific formula for calculation is as follows:

In formula (7), M and N is the display resolution of tested reinforcing LCD MODULE;

The same, the brightness value showing 9 measurement points in area can be obtained, and reinforce LCD MODULE 9 homogeneity P under obtaining hot environment according to middle maximal value, minimum value and center brightness at 9 ₉

L in formula (8) _maxfor reinforcing the maximum brightness value in LCD MODULE 9 brightness values, L _minfor reinforcing the minimum luminance value in LCD MODULE 9 brightness values,

LCD MODULE center brightness L is reinforced under calculating hot environment according to above-mentioned formula (7) _center, under calculating hot environment according to above-mentioned formula (8), reinforce LCD MODULE 9 homogeneity P ₉light characteristic index.

2. reinforce the measuring method of LCD MODULE display brightness in high temperature environments according to claim 1, it is characterized in that: under calculating hot environment, reinforce LCD MODULE 25 homogeneity P ₂₅light characteristic index; Specific formula for calculation is as follows:

L in formula (9) _maxfor reinforcing the maximum brightness value in LCD MODULE 25 brightness values, L _minfor reinforcing the minimum luminance value in LCD MODULE 25 brightness values;

LCD MODULE 25 homogeneity P are reinforced under obtaining hot environment according to above-mentioned formula (9) ₂₅.